Apparatus for promoting circulation in steam-boilers.



H. SCHOFIELD (IL 0. H. SEDGWICK.

APPARATUS FOR PROMOTING CIRCULATION IN STEAM BOILERS.

Patented Apr. 11, 1916.

APPLICATION FILED JULY 5. I912. 1,179,141.

2 SHEETS-SHEET I.

wo'ch M W W H. SCHOEIELD & C. H. SEDGWICK.

APPARATUS FOR PROMOTING CIRCULATION IN STEAM BOILERS. APPLICATION FILED JULY 5, I9I2.

Patnted Apr. 11,1916.

2 SHEETS-SHEET 2.

THE COLUMBIA PLANOGRAPH cm, WASHINGTON, D. c.

' rest on the wall of the furnace so that they 'NigE HARRY SCHOFIELD AND CECILv HOWARD SEDG-WICK, OF LONDON, ENGLAND, ASSIGNORS OF ONE-THIRD TO OLIVER PRESCOTT MACFARLANE, ONE-THIRD TO ROSS, AND ONE-THIRD TO SAID HARRY SCHOFIELD, ALL OF LONDON, ENGLAND.

Specification of Letters Patent.

Patented Apr. 11, 1916.

Application filed. July 5, 1912. Serial No. 707,794.

To all whom it may concern:

Be it known that we, HARRY SCHOFIELD and CnoiL HOWARD Snoewrox, both subjects of the King of Great Britain, residing, respectively, at 117 and 118 Leadenhall street, E. Q, in the county ofLondon, England, and 36 West Ferry road, Millwall, E., in the county of London, England, have invented certain new and useful Improvements in or Relating to Apparatus for Promoting Circulation in Steam-Boilers, of which the following is a specification.

This invention has reference to apparatus for promoting circulation'in steam boilers.

The class of apparatus to which the invention applies is that in which a saddle or casing is placed over the boiler furnace or flue, which may be that of a Lancashire or Scotch marine boiler, and is provided with a tapering or wedge shaped nozzle or hood, the arrangement being such that the water and steam passing up between the saddle and the furnace are discharged along the top of the latter from the Wider end or mouth of the nozzle.

The main object of the present invention is to provide a convenient adjustable or flexible arrangement of combined saddle and hood which can be easily inserted into the boiler and can be applied to furnace fines of different diameters and in any desired position along the same without any drilling or cutting of the boiler parts being necessary.

A further object of the invention is to enable the parts of the saddle and the nozzle to be secured in position, if desired without the use of fixing bolts and nuts, the screwing and unscrewing of which-is awkward inside a boiler.

According to the invention the end walls of the saddle, which are partly annular and project therefrom radially like ordinary furnace flanges or Adamson rings, may be made flexible so that they can be bent to suit different furnaces, and may be fastened in place by a girth rod or strap connection or i '1 and 2, the false-flanges orflexible enda chain passing under the flue and provided with suitable tightening devices. The saddle itself may rest on these flexible endwalls, or false-flanges as they may be termed, and may be made up of long and rather narrow curved plates or sections overlapping each other at the edges, and adjusted to suit the width or span required.

The false-flanges or end-walls may consist of short plates or link-like sections resting edgewise on the boiler furnace, so that the effective width or span of the false halves arranged to overlap and to be bolted or otherwise secured together to make a complete nozzle, resembling more or less an inverted scoop, the wider or open end of which may be practically semi-circular in shape. This nozzle may be suitably bolted or'wedged to or fixedupon the adjacent edges of the two upper plates or sections of the saddle.

In order that the invention may be clearly understood and readily carried into effect. reference will now be had to the accompanying drawings which illustrate by way of example one construction of the improved circulating apparatus.

In these drawings: Figure 1 is a general side elevation of a part of a boiler fine or furnace provided with a flexible oirculator SIDNEY JOHN such as referred to. Fig. 2 is a general I transverse section on the line 22 of Fig. 1, looking toward the right, that is to say toward the rear of the nozzle of the circulator. Fig. 2* is a view looking into the mouth of the circulator hood. Figs. 3, 4:

and 5 are detail views to a larger scale howing one of the links of the flexible falseflange respectively in side view, top edge or plan view, and section, the section being taken on the line 5-5, Fig. 3. Figs. 6 and 7 illustrate in longitudinal and transverse section a detail modification of the directing hood or nozzle hereinafter referred to.

According to the example shown in Figs.

walls or supports for the saddle, consist of short thin plates a forming links which are connected by bolts or hinge pins 6 through their over-lapping ends, thus forming a flat flexible band which can be bent edgewise to difierent curvatures, to suit different sizes of furnace A. Each link or section 0; of the flexible-flange has laterally projecting buttress-pieces or rests c of which only two are indicated in Fig. 1 for the sake of clearness. These rests 0 bear against the wall of the furnace and serve to keep the link at right angles to the boiler furnace. edges the links, or some of them, have projections (Z such as metal loops or bolts, servas fasteners for the outer or saddle plates 6. The said outer plates or sections 6 of the flexible circulator have a series of holes (Z at each end, through which the projections (Z may be interchangeably passed when the plates are in position, the different holes permitting of the plates being adjusted near to or farther from the hood or nozzle. In the example shown the final fixing of the plates 6 is effected by wedges f driven through the loops or projections cl, in order to key the said plates in position. In some cases however they might be fixed by means of nuts screwed on to studs fixed on or secured to the link-plates a. In the manner indicated the degree of edgewise overlap of the outer plates 6 can be varied by passing the loops (Z through different holes (Z and the span of the flexible saddle can be adjusted to suit the size or curvature of the furnace while maintaining a practically tight joint or fit all along the overlapping edges 6 of the saddle-plates or sections sufiicient to preserve the upward current of water between the saddle and the furnace itself.

9 is the hood or nozzle of the circulator which is formed in two main parts or halves connected along the overlapping seam 9 This hood or nozzle may be arched or semicircular in transverse section as shown, or it may be of any other convenient section, for example more or less rectangular with its upper corners rounded. It is supported by the edges of the upper plates 6, as above referred to, a narrow vertical edging strip it being arranged to complete the joint along each side of the hood, such strip forming in effect a vertical flange along the upper edge of the adjacent plate 6. At their ends these edging strips h are connected by brackets or lugs k and bolts 7L2, to the flexible endwalls or flanges a of the saddle. A tie bolt 2' is arranged between the ends of the two parts or sides of the flanges a at the front of the hood g, as shown in Fig. 2 instead of extending the front flange completely over the furnace. This leaves the mouth of the hood entirely open and uninterrupted for the free outflow of the water and steam from the circulator. Similar tie bolts may also be arranged between the two strips 71,, for strengthening purposes, such bolts extending across the under part of the nozzle.

7', j, are chains which are connected to the At their outerlower ends of the flexible false-flanges a and pass under the boiler furnace where they are provided with a tightening device, such as a pair of shackle hooks it, having eyes fitting on a screw-bolt 70 and acted on by tightening nuts The chains thus form a strap or girth by which the false flanges are securely held on the furnace.

The hood or nozzle 9 may be held down by brackets and bolts Z Z or other devices, connecting it to the said edging or flanging strips h, and in some cases these strips might be formed or fixed directly on the top sections of the saddle if desired. Moreover in some cases, as indicated in Figs. 6 and 7, the hood 9 may be provided with one or more apertures or slots 9 in its upper portion, for the escape of steam, a cover plate or shield g being arranged a little above and parallel with the hood to prevent priming. This shield may be supported on the hood by short stay pins or distance pieces 9 for example.

It will be seen that the wedging arrangement (Z above described obviates the necessity for screwing or bolting the main parts or sections in position as they are provided with the. loops, slotted lugs or eye-pieces (Z into which the wedges f can be easily driven. These wedges may be loosely connected to the adjacent parts for instance by belts or pins passing through slots in the wedges themselves, (thus serving to prevent the wedges falling and getting accidentally lost inside the boiler), the said slots being large enough to permit the. necessary play or free movement of the wedges for driving them home. Suitable directing pieces, fins 01' strips m either curved or straight may also be fitted inside the saddle or the nozzle to assist in directing the flow toward the middle of the same and also forward toward the. outlet thereof.

Obviously the invention may be modified in various ways in carrying the same into eflect without departing from the general nature thereof. Thus for instance the shape of the hood g might be modified, and two or more smaller hoods might be used and in some cases these might point in diverging directions or even in different directions.

What we claim and desire to secure by Letters Patent of the United States is 1. In a saddle-shaped circulating arrangement for application to steam-boiler flues, the combination of a saddle formed in sections provided with sets of holes; flexible and partly annular false-flanges formed of link-plates hinged together; lateral projections on said link plates for enabling them to keep upright on their edges relatively to the wall of the flue, without interfering with the access of water to the latter; a chain and yoke connected to the end links for securing the said flanges around the flue;

projecting loops on said links adapted to be passed through the holes in the saddle sections; and wedge devices fitting in said loops for positively connecting the said saddle with the link-plates without the manipulation of bolts or screws, substantially as described.

2. In a saddle-shaped circulating arrangement for application to steam-boiler flues, the combination of a series of adjustable plates forming sections of the circulator; a longitudinal, tapering dischar e hood situated at the top of the circulator; flexibly connected chain-links forming false-flanges to support the circulator, which flanges are Copies of this patent may be obtained for five cents each,

vices and chains for drawing interrupted opposite the mouth of'the hood; members for bridging such interrupted part; wedge devices for connecting said flanges to the plate sections; and'shackle dethe flexible flanges tight around the boiler flue, substantially as described.

In testimony whereof we affix our signatures in presence of two wltnesses.

HARRY SCHOFIELD. CECIL HOWARD SEDGWIOK.

Witnesses:

C. P. LIDDON, C. BARNARD BURDON.

Washington, D. 0.

by addressing the Commissioner of Patents, 

